• Journal of Chest Surgery
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• v.36 no.4
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• pp.229-241
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• 2003

Background:Autogenous vein is the preferred vascular graft for patients who require coronary artery bypass surgery or peripheral arterial bypass surgery. When an autogenous vein is not available, an allograft saphenous vein can be used as an alternative conduit. Although arterial homograft has been under investigation since the beginning of this century, the viability of endothelial cells and the optimum mode of storage for the venous and arterial allografts is controversial. In addition, with the recently gained knowledge of vascular endothelial functions, such as the production of nitric oxide or thrombomodulin, the viability and antigenicity of endothelial cells are being studied again. The purpose of this study was to evaluate the viability of endothelial cells in the preserved human saphenous veins. Material and Method: The veins were stored in a $4^{\circ}C$ RPMI (Roswell Park Memorial Institute) 1640 solution including 10% fetal calf serum, for one, three, five, seven or fourteen days. After the completion of the storage period, the veins were divided into two groups: Group I: studied immediately at $4^{\circ}C$ (cold) storage (I-1, I-3, I-5, I-7, I-14), and Group II: studied after storage at $-196^{\circ}C$ liquid nitrogen tank (cryopreservation) in an RPMI 1640 solution containing 10% DMSO for two weeks (II-1, II-3, II-5, II-7, II-14). Light microscopy and scanning electron microscopy (SEM), frypan blue exclusion testing, and thrombomodulin immunohistochemistry were performed. Result: In a morphometric study using SEM, there was statistically significant increase in Gundry Score in Groups I-7, I-14, II-5, II-7, and II-14 and showed cellular destruction (p<0.05). In the thrombomodulin immunohistochemistry study, there was reactivity in Groups I-1, I-3, and I-5, but the cryopreserved group revealed decreased reactivity (p<0.05). The trypan blue exclusion testing also showed superior viability in cold storage Group I. Conclusion: Venous allografts preserved in a $4^{\circ}C$ RPMI 1640 solution showed well preserved endothelial cellular integrity and thrombomodulin expression at up to seven days of preservation. Although cryopreservation of venous allografts stored in 10% DMSO -RPMI 1640 solution maintained the endothelial cellular structure on SEM, immunohistochemistry from the thrombomodulin and trypan blue exclusion testing showed decreased viability, It remains to be seen whether the decreased thrombomodulin reactivity could be restored, and what the nature to the relationship is between thrombomodulin and long-term patency of allografts.

• Journal of the Korean Society of Radiology
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• v.82 no.5
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• pp.1281-1286
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• 2021

Brainstem infarction due to vertebrobasilar insufficiency is a rare initial presentation of systemic lupus erythematosus (SLE) patients and small-vessel dissection as the direct cause of infarction has not been reported. We report the case of a 20-year-old female with acute infarction on the right side of the pons due to a small artery (pontine perforator) dissection, identified on digital subtraction angiography and high-resolution vessel wall MRI (vwMRI). She was diagnosed with SLE based on the presence of neurologic disorders and relevant laboratory findings. The pontine perforator-dissecting aneurysm had occluded and the right distal vertebral artery had resolved on subsequent vwMRI. She had a modified Rankin Scale (mRS) score of 1 at discharge with mild symptom improvement, and exhibited no further aggravation of symptoms at 3 or 12 months, maintaining an mRS score of 1.

• Journal of radiological science and technology
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• v.6 no.1
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• pp.21-26
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• 1983

DSA는 해상능(解像能)에 있어서는 일반적(一船的)인 혈관(血管) 조영술(造影術)에 비해서 다소 못미치지만 소량(小量)의 조영제(造影劑)로도 혈관구조(血管構造)를 잘 관찰(觀察)할 수 있으며 큰 차이의 조직(組織)두께차를 적절히 수용(受容)할 수 있으며 필름의 소모도 적게 되었다. DSA는 경동맥검사(頸動脈檢査)에 가장 중요한 위치를 차지하며 많이 시행(施行)되고 있다. 혈관(血管)의 모양을 변화(變化) 시키는 여러 질환에서 혈관(血管)상태나 혈류(血流)의 변화(變化), 내경(內經)도 알수 있다. 최근에는 흉부(胸部)나 후두(喉頭) 등(等)에도 적용하여 일반검사(一般檢査)와 비교(比較)하여 좋은 결과(結果)를 얻고있다. 또 확대촬영(擴大撮影)이나 입체촬영(立體撮影)까지 응용(應用)하여 좋은 성적을 얻고 있다. DSA는 보고자 하는 혈관상(血管像)만을 단시간에 볼 수 있고 유연성(柔軟性)이 있고 비침습성(非侵襲性)(noninvasive)이며 간단한 검사방법(檢査方法)이라는 점 등(等)에서 매우 유용(有用)한 검사(檢査)라 하겠다.

• Korean Journal of Biological Psychiatry
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• v.23 no.3
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• pp.80-88
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• 2016

Vascular dementia is a very frequent form of dementia. Debates over classification and diagnostic criteria, and controversy over identifiable treatment targets will continue until distinct pathophysiological mechanism of vascular dementia is found. Clinical diagnostic criteria are sufficiently strong to be useful for clinical trials, but need further refinement. Cognitive changes in vascular dementia are more variable than other disorders, and are dependent on the vascular pathology. Accurate diagnosis of vascular dementia is known to need the presence of reliable cerebrovascular disease on brain imaging. Although it seems obvious that cerebrovascular disease causes pathological damage and impaired cognition, it is very difficult to find the accurate contribution of cerebrovascular pathology to cognitive decline. Most studies have shown a small but significant benefit of cholinesterase inhibitors on cognition, the significance of this effect has been slight and benefits on global functioning, activities of daily living, and behaviour have not been consistently reported. Management of vascular dementia should focus on identifying and managing vascular risk factors.

• The Monthly Diabetes
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• s.216
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• pp.10-13
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• 2007

요즈음은 인터넷이나 대중매체를 통해 일반인들도 다양한 질병에 대한 많은 정보를 얻을 수 있다. 이에 속하는 것으로 당뇨병은 대표적 만성질환이며 누구나 한번쯤은 들어 본 적이 있는 질환일 것이다. 현대와 같이 고도로 의학이 발달한 상황에서도 만성질환은 완치되는 것이 아니고 평생 관리를 해야하는 질병이기 때문에 많은 환자들이 살아가는 동안 서서히 지치게 되고 관리를 소홀히 하게 됨으로써 당뇨병성 신경병증, 망막증, 신증, 대혈관병증(뇌졸중, 심혈관질환, 말초혈관질환) 등과 같은 합병증의 발생으로 일상생활에 지장을 받게 된다. 따라서 당뇨병환자는 일생 주기적으로 검사와 함께 자신에게 맞는 약을 복용하고 경우에 따라서는 인슐린 주사까지 맞음으로써 지속적인 혈당관리를 하여 합병증의 발생을 최소화 하는 것이 필요하다. 이상에 언급한 다양한 합병증 중 가장 중요한 사망원인은 심혈관질환으로 40세 이후에 발생한 당뇨병환자에서 전체 사망 원인의 50% 이상을 차지한다. 또한 대부분의 당뇨병성 만성합병증이 적극적인 혈당관리로 효과적인 예방이 가능한 반면 심혈관질환과 같은 대혈관합병증은 혈당조절이 잘 되고 있는 환자에서도 당뇨병 발생 기간과 무관하게 발생하고 또 여러 혈관에 걸쳐 다발적이고 광범위하게 발생하므로 원인이 되는 다른 위험요소들에 대한 관리가 함께 이루어져야 한다.

• Journal of the Korean Orthopaedic Association
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• v.56 no.2
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• pp.173-177
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• 2021

Recurrent spontaneous hemarthrosis is a relatively rare complication of total knee arthroplasty. This paper reports a case of a patient treated with arterial embolization for recurrent spontaneous hemarthrosis even after undergoing arthroscopic surgery. The patient had several relapses after total knee arthroplasty.

• Journal of the Institute of Electronics Engineers of Korea CI
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• v.48 no.4
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• pp.21-26
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• 2011

Feature ranking is useful to gain knowledge of data and identify relevant features. In this study, we proposed a use of feature ranking for classification of neuro-degeneration and vascular dementia in micro-Raman spectra of platelet. The entire region of the spectrum is divided into local region including several peaks, followed by Gaussian curve fitting method in the region to be modeled. Local minima select from the subregion and then remove the background based on the position by using interpolation method. After preprocessing steps, significant features were selected by feature ranking method to improve the classification accuracy and the computational complexity of classification system. PCA (principal component analysis) transform the selected features and the overall features that is used classification with the number of principal components. These were classified as MAP (maximum a posteriori) and it compared with classification result using overall features. In all experiments, the computational complexity of the classification system was remarkably reduced and the classification accuracy was partially increased. Particularly, the proposed method increased the classification accuracy in the experiment classifying the Parkinson's disease and normal with the average 1.7 %. From the result, it confirmed that proposed method could be efficiently used in the classification system of the neuro-degenerative disease and vascular dementia of platelet.

• Journal of Chest Surgery
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• v.30 no.6
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• pp.553-558
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• 1997

Arterial allografts have known advantages over prosthetic vascular conduit for treatment of heart valvular disease, congenital heart disease and aortic disease. Cell viability may play a role in determining the longterm outcome of allografts. Endothelial cell is one important part in determining the allograft viability. To evaluate the viability of endothelial cells using current allograft preservation technique, porcine heart valve leaflets and arterial wall were subjected to collagenase digestion. Single endothelial cell suspension was labeled with GSA-PITC(Griffonia simplicifolia agglutininfluorescein isothiocyan te), a vascular, endothelial cell specific marker. The cell suspension was washed and incubated with Pl(Propidium iodide), which does not bind with viable cells, Endothelial cell viability was evaluated by calculating the percentage of GSA-FITC(+) and Pl(-) group using flowcytometric analysis. Allografts were treated with $4^{\circ}C$ antibiotic solo!ion for 24 hours for sterilization. After this, half of allografts were stored in $4^{\circ}C$ RPMI 1640 with HEPES buffer culture medium with 10% fetal bovine serum for 1 to 14 days(Group I). Another half of allografts were cryopreserved with a currently used technique (Group II). During the procurement and sterilization of arterial allografts, 22.8% and 24.4% of endothelial cell viability declined, respectively. In Group I, 11.9% of endothelial cell viability declined further steadily during 14 days of storage. In Group II, 13.7% of endothelial cell viability declined. These results show that largest loss of endothelial cell viability occurs during the nitial process. After 14 days of arterial allograft storage under $4^{\circ}C$ nutrient medium or cryopreservation, about 40% of endothelial cell viability is maintained. There were no differences between the endothelial cell viability from aortic valve leaflet, pulmonic valve leaflets, aortic wall and pulmonic wall.

• Tuberculosis and Respiratory Diseases
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• v.50 no.5
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• pp.557-567
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• 2001

Background : Tumor angiogenesis is required for tumor growth and metastasis. In this study, we investigated the correlation between the intensity of angiogenesis and stage, nodal status, histologic type, metastasis and survival rate of non-small cell lung cancer. Method : Formalin fixed, paraffin embedded surgical specimens of 45 patients who had surgically resected primary non-small cell lung cancers without pre or post operative adjuvant chemotherapy or radiotherapy were examined. The microvessel count(MVC) was demonstrated by immunohistochemical staining for CD31(platelet endothelial cell adhesion molecule, PECAM). Results : Microvessel counts(MVCs) in stage IIIA and IIIB were higher than in stage I and II(p<0.05). The MVC in patients with lymph node metastasis was higher than that in patients without lymph node metastasis, although the difference was not statistically significant(p>0.05). However, in adenocarcinoma, the MVC in patients with lymph node metastasis was significantly higher than that seen in patients without lymph node metastasis(p<0.05). The MVC in adenocarcinoma was higher than that in squamous cell carcinoma(p<0.05). The difference between the MVCs of adenocarcinoma and squamous cell carcinoma was not statistically significant in stage I and II or N0 stage(p>0.05). However, in stage IIIA and IIIB or N1~3 stage, the MVC in adenocarcinoma was higher than that in squamous cell carcinoma(p<0.05). MVC was more increased when metastasis developed within 12 months. In the same histologic type and stage, the duration of survival time in patients with high MVC was shorter than in patients with low MVC, however the difference was not statistically significant(p>0.05). The survival rate in patients with high MVCs was lower than that in patients with low MVCs(P<0.05). Conclusion : In non-small cell lung cancer, MVC correlated relatively well with pathologic stage, nodal status(limited in patients with adenocarcinoma), histologic type, postoperative metastasis and survival rate. However, in the same histologic type and stage, MVC was not significantly related to the duration of survival. Therefore the assessment of the intensity of angiogenesis in non-small cell lung cancer may be helpful in predicting prognosis and in selecting patients for systemic adjuvant therapy of potential metastasis according to the results.

• Journal of Convergence for Information Technology
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• v.12 no.4
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• pp.119-125
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• 2022

In the study, we endeavored to investigate the effect of phenylephrine, isoprenaline and prazosin on the tissue-specific vascular contractility and to determine the mechanism involved. There were few reports addressing the question whether thin or thick filament modulation is included in phenylephrine, isoprenaline and prazosin-induced regulation. We hypothesized that isoprenaline and prazosin play a role in tissue-dependent regulation of vascular contractility. Denuded arterial muscles of Sprague-Dawley male rats were suspended in organ baths and isometric tensions were transduced and recorded using isometric transducers and an automatic data acquisition system. Interestingly, sustained continuous contraction of thoracic and abdominal aorta. Furthermore, isoprenaline and prazosin together with phenylephrine inhibited transiently and persistently vasoconstriction of thoracic and abdominal aorta suggesting that additional mechanisms (e.g. decreased receptor density, chemical interaction, postreceptor signaling or distribution of agonists) might be included in the modulation of vascular contractility.